/Engine/Source/Runtime/AugmentedReality/Public/ARSystem.h
Saves the AR world to a byte array using an async task
[TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FARSaveWorldAsyncTask](API\Runtime\AugmentedReality\FARSaveWorldAsyncTask), ESPMode::ThreadSafe > OnSaveWorld() const